25680540 has 72 divisors (see below), whose sum is σ = 76435632. Its totient is φ = 6440960.

The previous prime is 25680521. The next prime is 25680541. The reversal of 25680540 is 4508652.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 25680498 and 25680507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25680541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16600 + ... + 18080.

It is an arithmetic number, because the mean of its divisors is an integer number (1061606).

Almost surely, 2^25680540 is an apocalyptic number.

25680540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25680540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38217816).

25680540 is an abundant number, since it is smaller than the sum of its proper divisors (50755092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25680540 is a wasteful number, since it uses less digits than its factorization.

25680540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527 (or 1508 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 25680540 is about 5067.5970636979. The cubic root of 25680540 is about 295.0312712230.

The spelling of 25680540 in words is "twenty-five million, six hundred eighty thousand, five hundred forty".